Catalytic conversion method of aldose into ketose

A catalytic conversion method and technology of aldulose, applied in the field of catalytic conversion of aldulose, can solve the problems of many by-products, limited substrate concentration and high research and development cost, and achieve the effects of low equipment requirements, simple separation and low cost

Active Publication Date: 2016-10-19
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Abstract
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  • Application Information

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Problems solved by technology

Enzymatic isomerization can generally obtain higher yield and selectivity. Studies have shown that xylase can catalyze glucose isomerization, and the yield of fructose is 42%, and there are only 8% impurities in the reaction solution; but Enzymatic catalysis has strict requirements on the production environment, high research and development costs, and limited substrate concentration, so it has not been widely used in industry
Alkali-catalyzed isomerization is the earliest researched sugar isomerization method and is currently widely used in industry. For example, in the preparation process of the rare sugar tagatose, calcium hydroxide is used as a catalyst to catalyze the isomerization of galacturone to prepare tagatose. sugar; but due to the influence of the reaction balance, the yield of this catalytic process is low, and the reaction requires high acid and alkali resistance of the equipment, there are many by-products, and the product is not easy to separate and purify

Method used

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  • Catalytic conversion method of aldose into ketose
  • Catalytic conversion method of aldose into ketose
  • Catalytic conversion method of aldose into ketose

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] (1) Reflux the single-walled carbon nanotubes in 0.1M nitric acid solution at 80°C for 4 hours, wash and dry to obtain oxidation-modified single-walled carbon nanotubes, wherein the carboxyl content is 0.5mmol / g, and the phenolic hydroxyl content is 0.1mmol / g, and the lactone content is 0.05mmol / g; using the impregnation method, immerse the oxidation-modified single-walled carbon nanotubes in ferric chloride solution, and introduce 0.1wt % iron element, after drying, an oxidation-modified single-walled carbon nanotube loaded with iron element is obtained.

[0055] (2) Weigh 10 g of glucose and add water to 100 ml to prepare a 100 g / L glucose solution. Weighing 2 grams of the oxidation-modified single-walled carbon nanotubes loaded with iron element prepared in step (1), and adding it into the glucose solution to obtain a reaction solution. Divide the reaction solution into 3 parts, 30 ml each, seal and place them in oil baths at 80°C, 120°C, and 140°C, respectively, wi...

Embodiment 2

[0060] (1) Treat multi-walled carbon nanotubes in hydrogen peroxide at room temperature for 4 hours, wash and dry to obtain oxidatively modified multi-walled carbon nanotubes, wherein the carboxyl content is 0.4mmol / g, and the phenolic hydroxyl content is 0.2mmol / g, The content of lactone is 0.03mmol / g; the oxidatively modified multi-walled carbon nanotubes are immersed in manganese nitrate solution by impregnation method, and 0.05wt% manganese element is introduced into the oxidatively modified multi-walled carbon nanotubes, and after drying Oxidatively modified multi-walled carbon nanotubes containing manganese are obtained.

[0061] (2) Weigh 10 grams of arabinose and add water to 200 ml to prepare a 50 g / L arabinose solution. This arabinose solution is divided into 4 bottles, each bottle is 30 milliliters, and 0.5 grams, 1 gram, 1.5 grams, 3 grams of multi-walled carbon nanotubes containing manganese elements obtained in step (1) are added respectively, sealed After that,...

Embodiment 3

[0065] (1) Treat the multi-walled carbon nanotubes with ozone at room temperature for 2 hours to obtain oxidatively modified multi-walled carbon nanotubes, wherein the carboxyl content is 0.8mmol / g, the phenolic hydroxyl content is 0.08mmol / g, and the lactone content is 0.01mmol / g; adopt the impregnation method, immerse the multi-walled carbon nanotubes of oxidation modification in the aluminum sulfate solution, introduce the aluminum element of 0.2wt% in the multi-walled carbon nanotubes of oxidation modification, after drying, obtain containing aluminum element Oxidation-modified multi-walled carbon nanotubes.

[0066] (2) 20 grams of oxidatively modified multi-walled carbon nanotubes containing aluminum elements that step (1) makes are weighed, packed into a fixed-bed reactor (diameter 15mm, long 1000mm), and the temperature of the fixed-bed reactor is raised to To 120 degrees Celsius, the pressure rises to 1 MPa. Weigh 1 kg of galactose and add water to 2.5 liters to for...

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Abstract

The invention provides a method for simultaneous isomerism of aldose into corresponding ketose and epimer aldose. The method uses the aldose as a substrate, and selects oxidation modified carbon nanotube supported with iron, aluminum, calcium, magnesium, molybdenum, chromium, and manganese elements of carbon nanotubes, or graphene as a catalyst. When the catalyst is mixed with the substrate aldose to not only catalyze aldehyde ketone isomerism to obtain corresponding ketose but also catalyze isomerism of C2 to obtain a corresponding C2 isomerism aldose catalyst, so as to realize simultaneous isomerism by one catalyst to obtain two rare functional sugars. The method has the advantages of high isomerism efficiency, simple operation conditions, reutilization of catalyst, small energy consumption, green, low cost, and potential in industrial mass production.

Description

technical field [0001] The invention belongs to the field of sugar chemistry, and in particular relates to a catalytic conversion method of aldose and ketose. Background technique [0002] Sugar is the most abundant and widely distributed organic compound with important physiological and biochemical functions in nature, and plays an irreplaceable role in the fields of pharmacy, food, and chemistry. According to its composition, sugars can be divided into monosaccharides, and oligosaccharides and polysaccharides formed by polymerization of monosaccharides. [0003] Monosaccharides are generally polyhydroxy aldehyde / ketone structures composed of 3 to 6 carbons. Common monosaccharides in nature include glucose, galactose, and fructose. Among them, glucose is the most widely existing monosaccharide in nature. Its structure and function were first known, and it is also a monosaccharide widely used in the food and drug industry. The common monosaccharides that exist widely in n...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07H3/02C07H1/00
Inventor 杨池张亚杰李丽丽张建张业新杨春虹
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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